Smell training?

i’ve got one non working nostril thanks to covid.

Has anyone tried smell training or other therapies/procedures to get it back?

Is there such a thing? I’m always stuffed up, so smelling is a luxury for me.

It’s the first resort — basically you smell strong scents like lavender etc to retrain the nerves. Next stop is steroids, then PPL, then surgery

Will say I’m sat on a train across the aisle from a heavy weed smoker so one side works just fine